Coil bending machine for monoplane projection lamp filaments



A. GRElNr-:R Erm. 2,686,539 COIL BENDING MACHINE FOR MONOPLANE PROJECTION LAMP FILAMENTS Aug. 17, 1954 4 Sheets-Sheet l Filed April 29, 1953 Allg- 17, 1954 A GREINER ETA. 2,686,539

COIL. BENING MACHINE FOR MONOPLANE PROJECTION LAMP FILAMENTS Filed April 29, 1953 '4 Sheets-Sheet 2 /N l l /N com sra/2 mmm/ N Wr INVENTOR Aug. 17, 1954 Filed Apri1'29, 1955 EINER ET AL 2,686,539

A. GR COIL BENDING MACHINE FOR MONOPLANE PROJECTION LAMP FILAMENTS 4 Sheets-Sheet 3 INVENTORS.

/irno Greiner I @ita R. WaZZek wn HTT MEZ A. COIL BENDING MACHI GREINER ETAL 2,686,539

NE FOR MONOPLANE PROJECTION LAMP FILAMENTS Aug. 17, 1954 4 Sheets-Sheet 4 Filed April 29, 1953 INVENTORS, `re4ner t 0zzaR. Wailea iut E@ ATToR Patented Aug. 17, 1954 HINE FOR MONOPLANE COIL BENDIN G MAC PROJECTION Arno Greiner, Irvington, and Otto East Keansburgh, N. J., assignors to Westinghouse Electric Corpor LAMP FILAMEN TS R. Wollentin,

ation, East Pittsburgh,

Pa., a corporation of Pennsylvania Application April 29, 1953, Serial No. 351,952

4 Claims. l

This invention relates to `the manufacture of incandescent lamps and, more particularly, to a coil bending machine for monoplane projection lamp filaments.

The objective in the design of projection lamps is to fill the aperture of a projection system with a light source of high brightness and maximum uniformity. This is accomplished vby arranging the filament coils in a V'single `or Adouble vertical plane, accurately loca-ted with respect to the optical system by -a prefocused base. The loi-'plane lament, with coils arranged in two parallel rows vso placed that the coils in one row fill in the Isp-aces between those of the other, has much greater uniformity and higher average brightness than the single row monoplane filament. However, where decreased cost is an important factor and .in slide projector applications where it is desirous to spread the light over relatively large areas through the use of a tilted spherical mirror to thus produce greater 'eniciency, the monoplane filament is generally employed.

The monoplane filament for a conventional electric lamp, .such .as a projection lamp, is generally `formed from a continuous coil into a multisection nlament, having .for example six sections. The first and last sections are bent longer than the secondy third, .fourth and fifth or inner sections, so that a 4secondary right angle bend may be made therein to provide Yfilament mounting legs. These secondary bends are made at a desired point in said sections (the same relative location as the bending point .of the center sections), to .form .the lfilament leg portions perpendicular -to the parallel center sections of the rif-lament.

The purpose of this invention is Vvto provide a coil bending machine for producing .a bend in a .predetermined loop consisting `of one convolution of a continuously wound coil of predetermined given length. The bend is a 180 turn and is repeated a plural-ity of times at given desired intervals to produce a coil pattern of a given number of sections parallel in their relationship to each other .and of desired required lengths. This machine is an improvement and modication of the bending machine disclosed in application1 Serial No. 290,776, filed May 29, 1952, by the same inventors, assigned to the same assignee as the subject application, and entitled Coil Bending Machine for Projection Lamp Filaments.

The coil bending machine of our invention for monoplane projection lamp laments is provided with a cam shaft driven by a fractional 'horse lever, thereby releasing power motor and a one revolution clutch for vmoving the cam shaft through a cycle of 'the bending operation. Downward motion of a hand lever advances a Vcoil bending blade toward a continuous coil positioned 'against a coil stop and locator, Yjust making contact therewith. During the course of the hand 'levers travel it closes a coil preheat micro switch in a coil preheating circuit thus passing preheat current to the coil. `At the end of its motion the hand lever trips a' clutch release the clutch and starting the Cam shaft on its one revolution cycle of operation.

A coil heating switch control cam activates a second micro 4switch in a main coil heating circuit which continues to supply heating current after the hand lever micro switch opens. The period of time during which this heating current is applied to the coil is varied and controlled by the adjustable control cam which activates it. f Immediately after the coil heating switchcam takes action a coil stop and locator cam moves the coil stop and locator into its out position. At the same time a bending blade positioning cam moves the bending blade from its hand lever positioned location, as explained above, (i. e., merely touching the coil for electrical contact) forward into the coil and secures one loop vor turn of the coil between the bending blade and a pair of bending chisels, mounted on a pair'of hinged elements.

When the electrical circuit has been closed and one turn of the coil has been secured between the bending chisels and the bending blade, a bending chisel operating cam through connecting linkage swings the hinged elements and hence the bending chisels in a circular motion around the axis of a center hinge post to form the desired bend in the coil.

The operating cam and bending blade positioning vcam respectively return the bending chisel and the bending blade to their neutral positions. The coil stop and locator cam moves the coil stop and locator to its in position. The one revolution clutch arrives at its starting position where it is stopped by the clutch release lever.

According to our invention we have provided an improved. mounting for the bending chisel holders. We employ inodied hinged elements and apair of segments, each fastened to the outer surface of said hinged elements to provide the bending `chisels with a wider range of angular positioning with respect to the center hinge post. ln addition, this ,mounting provides better support tor the bending chisels and more accurate 4radial positioning of the chisels themselves with respect to the bending chisel holders.

We also employ improved bending chisels having outwardly tapered ats to provide clearance for the already formed sections of the coil undergoing bending.

In addition we employ a bending chisel operating slide bell crank lever having individual separable arms and hubs connected by an angular segment on one arm by which the angle between the individual arms of the bell crank lever may be varied to change the length of the slide stroke without necessitating a change in the bending chisel operating cam. This longer or shorter length of the slide stroke may swing the bending chisels any desired number of degrees below 180.

We further employ an improved coil stop and locator having a horizontally located transparent coil guide which holds the coil undergoing bending in a flat horizontal position.

In its general aspect the present invention has as its objective a coil bending machine for monoplane projection Vlamp filaments.

A specific object of the present invention is an improved means for mountng the bending chisels on the chisel holders to provide better support, and improved angular and radial location of said chisels.

A further object is a bending chisel operating slide bell crank lever having individual arms and hubs and connected by an angular segment on one arm to permit variation of the angular relationship between the bell crank lever arms.

An additional object is an improved coil stop and locator for monoplane filaments having a horizontally located coil stop for holding the coil flat in said locator and permitting greater accuracy in the alignment of said coil.

Other objects of the present invention will become apparent to those skilled inthe art to which it appertains as the description thereof proceeds.

In the attached drawings in which like numerals indicate similar parts throughout the several views:

Fig. 1 is an elevational view of a coil bending machine of our invention.

Fig. 2 is a plan view of the coil bending machine of Fig. 1.

Fig. 3 is a fragmentary elevational view of a conventional projection lamp having a monoplane multi-section filament which may be formed by the machine of our invention.

Fig. 4 is a horizontal sectional view of such a projection lamp filament along the line IV-IV of Fig. 3 in the direction of the arrows.

Fig. 5 is a plan view of a coil bending head showing a coil bending blade and a pair of hinged bending chisels at the start of a loop forming cycle and embodying an improved bending chisel mounting and bending chisel of our invention.

Fig. 6 is a vertical sectional view of the coil stop and locator along the line VI--VI of Fig. 5 in the direction of the arrows.

Fig. "I is a horizontal sectional viev.7 of the` coil bending head on the line VII-VII of Fig. 5.

Fig. 8 is a horizontal sectional view of the coil bending head on the line VIII-VIII of Fig. 7 in the direction of the arrows showing a continuous coil positioned against the coil stop and locator at the start of the 180 bending operation for forming the first section.

Fig. 9 is a view similar to Fig. 8 showing the completion of the first section bend in the monoplane projection lamp lament.

Fig. 10 is a view similar to Fig. 9 showing the retraction of the bending blade with the now bent coil thereon.

Fig. 11 is a view similar to Fig. 8 showing the once bent coil positioned against the stop and the location of the rst section on the bending chisels at the start of the second section bending cycle.

Fig. 12 is a view similar to Fig. 1l showing the location of four formed sections of the coil on the bending chisels at the start of the bending operation for forming the last section.

Fig. 13 is a View similar to Figs. 9 and 12 showing the position of the parts after the formation of the leg mounting portion inthe first section of the coil.

Fig. 14 is a view similar to Fig. 13 showing the position of the parts after the formation of the leg mounting portion in the last section of the coil.

Fig. 15 is a fragmentary side elevational View of the improved bell crank lever for the bending chisel operating slide showing the arms thereof in position for a preliminary 180 section forming bend of the coil.

Fig. 16 is a view similar to Fig. 15 showing the arms of the lever in position for a lament mounting leg portion bend for the first and last sections of the coil.

Fig. 17 is a schematic wiring diagram of the coil preheat circuit and coil heating circuit.

Fig. 18 is a diagram of operations of the coil bending machine.

Referring to the drawings, and in particular to Figs. 1 and 2, a coil bending machine for projection lamp filaments is designated by the reference numeral I0. This machine has a frame II comprising a platform I2 and a base I3 integrated by suitable side plates and corner supports. A starting hand lever I4 is mounted on an outer or hand lever shaft IG which is rotatable in a pair of brackets I'I and I8 depending from the bottom surface of the top mounting plate of the frame I I.

H andleoer mechanism On this shaft I6 is aixed an adjustable collar 20, shown in Fig. 2, carrying an arm 22 which engages a stop 24 on the bracket I8, thereby limiting the rotation of the shaft I5 and the hand lever I4. Adjacent the bracket I'I an arm 26, shown particularly in Fig. 1, is secured at one end to the shaft IS and pvotably connected at its other end to a bending blade slide rod 28 provided with an adjustable slot 30, and having a microswitch trip arm 32 on its lower end for closing a coil preheat microswitch 34. As shown in Fig. l', switch 34 is in series with a variable resistor 35 and one of the bending chisels as hereinafter described. One end of a lever 35 mounted in a suitable bracket 38 carries a pin which slides in the slot 30. The opposite end of the lever 36 carries a pin which is similarly engaged in a U-shaped slot in the upper end of a clutch release lever 4I).

The other end ci the lever il is secured to one end of a clutch release shaft l2 which rotates in a suitable bushing in the bracket' 38 and another bushing in a similar bracket I (Fig. 2). On the other end of the shaft 42 adjacent bracket d, is a clutch release lever Mi for releasing a one revolution clutch lil on a main cam shaft 43. An arm IIS, (Fig. 2) having a spring between its outer end and the bottom plate or the frame i3, provides suitable return means for the shaft 42.

Adjacent the arm 22 on the shaft I6 is a bending blade trip arm 5Fl, shown in Fig. l. The outer end of the arm 50 is engageable with av lower pin 5.1I extendingv from a bending blade arm 52 secured at its upper end. to a gear segment shaft 5 4jwhich is rotatable thereby in suitable bearings o n a coil bending head bracket 5.5. A bending blade gear segment 58,V secured to the outer end of the shaft 54, engages a rack 59 which is slidable in a trough 60 (Fig. 2) formed in the upper surface of the coil bending head bracket 56.

Itj will be understood that downward movement ofthe hand lever I4 causes forward movement of the slide bracket 58y by means of the connecting linkage just described. Secured on the slide rack 59 by suitable means, such as screws,`is a pair of bending blade mounting plates 62 and 64, connected by a right and left hand adjust'- ment screw 56. Adjustably mounted in a lateral Slot in the forward end of the mounting block 64 is a bendingI blade holder 68 which carries thereon the bending blade 'I0 for movement against and then insertion into a space between two predetermined turns ojf a continuous coil 'I I.

Bending blade final positioning mechanism Adjacent the bending blade trip arm 50, an adjustable bending blade connecting rod 'i2 is secured to the pin 5 I'carried on the lower arm of the bending blade arm 52, as shown in Fig. 2. The other end of the connecting rod 'I2 is pivoted on the upper end of a bending blade cam arm 74, shown most clearly in Fig. l, which has its lower extremit;r pivoted in ,a suitable bearing on a bracket 'i6 mounted on the base I3 of-the frame I I. The cam arm 'I4 carries a cam roller 13, a suitable distance between the bracket 'I and the connect-ing rod l2, for engagement with thebending blade final positioning cam as. hereinafter eX- plained. Suitable return means for the -connecting rod 'I2 is provided by a spring Sil, shown in- Fig. l, extending from the left end portion of the rod 'I2 to a mounting pin SI in the platform I 2 of the frame il.

The main cam shaft 4S is mounted on vthree brackets 84, S5 and 8G, shown in Figure.2on the base I3 of the frame ll and driven through gears in a gear boxs by suitable means suchas a t() hp. motor (not shown).

Coil stop and locator lmechanism As shown particularly in Fig. 2, a coil stop and locator cam 90 is aflixedto the shaft 48 adjacent the bracket 8B, for moving a-coilstonand.4 locator S2, as hereinafter explained. `A locator cam arm 94, shown in Fig. 1 adjacent the cam't; having its lower end rotatably pivoted to a suitable bracket 56 on ythe base I3 of the frame II, carries a cainroller 9S and has its upper end connected to an adjustable locator connecting rod I The other end of the rod 00 is pivoted on a lower horizontal locator arm I 22 having its otherI end fixed on a vertical Ylocator shaft IM, which rotates in a bearing bracket 108 mounted on the platform I2. The upper end of the shaft |04 is connected by means of an upper locator arm 01, iixed thereon as shown in Fig. 2, to the coil stop and locator S2 by a vertical pin'93 on the end of the arm Inl', secured in an annular groove |08 (Fig. 2) in the end or" the locator` Q2.

The coil stop and loca-tor 52 isslidable in a direction transverse to the bending blade 'I0 in a suitable bearing mounted in a coil stop and locator bracket H0. A U-shaped horizontal bracket II2 shown in Fig. 2 is provided on the bracket IIIlV under the locatorMSZ. Bracket II2 Award portion of the slide 140.;

has a pair oiadjustmentscrews. II3 andv I*I4.extending toward one another from its arm for engagement with a lug depending from a guide I I5, carried on the locator '92 adjacent the. groove |08r therein. An adjustable stop H6` is provided in the upper portion of the guide I I5 (Figv 1) for limiting forward motion of the locator 192 by engaging the outer surface of the bracket `I I0. A return spring I I 9 extends from a pin on the connecting rod |00', near its connection with the arm 94, to a pin I20 depending vfrom the platform I 2.

Coil stop and locator The operating end of the locator 92 (Fig. 6) adjacent the bending blade '10: has an improved transparent plastic coil stop 200, which i-ssecured to. theV locator 92 by means-of a screw 202; The coil stop 220 is provided with a coil stopslot 204 in itsv forward face for positioning a continuous coil .'I' therein, as hereinafter explained. This improved coil stop 2li!) provides -an operator, engaged inv positioning a continuous coil thereagainst, with better visibility. The width of the slot 204 accommodatesan already formed section andthe next section to be formed in the continuous `coilv lli, thus'facilitating ther formation of subsequent sections, as' hereinafter explained.

Bending blade final positioning @am Adjacent the coil stop and locator cam on the cam shaft 4 8, is the'bending blade nal positioning cam I2`I (Fig. .2) which engages the roller 1,8 on the cam arm 14, as shownV in Figure 1.

Bending chisel operating mecmxnism` Adjacent the @am shaft bracketss (Fig. 2) is the bending chisel operating cam I22f An improved bendingv chiselv bell crank lever 208, shown in Figs. l, 15 and 16, is pivoted on shaft 21.0 in a bracket I2't. on the platform I2 and-has a cam. roller I28 on its lower arm 2II in engagement with the cam |22. rIfhe other arml 2I2 of lever 210 is bifurcated to leave a slot.V I-30 in its upper end. A lblock |32 slides inthe slot |30 and its movement is: limited by adjustment screw 13,3 carriedby a plate l34bridging the slot |30. The block 32 is connected by apair of links |36 (Figs. 1 andz) to a block |38, depending from a bending chisel slide block 140. A vcenter clearance hole or slot L39 shown in Fig; 2, is provided inthe slide block 40, through which the upper arm 2I2- of the bell crankxlever 298 moves;vr A slideblock returnspring M2 hasone end connected to the slide. block Mt above the block |38 and its other end connected toV` a.-'suitable pin projecting fromr the platformY I2. This" block M0 isv slidably carried. by a mountingv bracket I44 upstandingi from the platform'r I2;

A pair of bending chisel links |46 and 143, shown in Figs. 1, 2,5 and 7", 'are connected. by IDeans of a common pivot pin i491 tothe for- The forward portions of the links'are lrespectively connected to a pair' of improved hinged elements 213; and 2M' .(Fig. .5) which swing about-a center hinge post H54. .This post-554. in turn; is mounted on asuitablev bracket I'ii (Fig l) onthe platform I2. The hinged elements ZIS and' 2 I4 carry bending chisel mounting segments 2I6 and? 2I8, .respectiveh/zy on whichV are mounted improved bending chisels 220 and 222, respectivelyyin normally parallel spaced relation to each` other for insertion froin the opposite direction into `the adjacent spaces in the two preselected turns whichboundthe.blade"1eceiving`space. l

7 Bell crank lever for bending chisel operating slide 'I'he lower arm 2II of the bell crank lever 208 (Figs. and 16) is provided with a separate hub 224 and an angular segment 228 adjacent said hub. The bifurcated arm 2 I2 in turnhas a separate hub on the shaft 2|0. A removable pin or bolt 228, extending through the arm 2I2 below the slot |30 can be secured in a plurality of adjustment holes 230 and 232, arranged in an arc near the periphery of the angular segment 226 of the lower arm 2II. The holes 230 and 232 are employed respectively for making a 180 section bend as shown in Fig. 15 and for a 90 lament mounting leg bend, as shown in Fig. 16.

It will be understood that When the pin 228 engages the hole 230 in the segment 226, the roller |28 on the end of the lower arm 2|| is closer to the bending chisel operating cam |22 than the case Where the pin 228 engages the adjustment hole 232, as shown in Fig. 16. Hence, in the showing of Fig. 15 the raised portion of the cam |22 will rotate the upper bifurcated end of the arm 2|2 of the lever 208 through a larger counterclockwise angle of rotation, the slide block |40 will have a longer stroke, and the chisels 220 and 222 will swing through a larger angle than in the showing of Fig. 16.

These adjustment holes 230 and 232 in the segment 226 are spaced at a predetermined interval so that when the pin 228 engages the hole 230, the improved bending chisels 220 and 222 are moved through an angle suicient to bend the coil '|I through an angle of 180. When the connecting pin 228 extends through the adjustment hole 232 in the segment 226 the bending chisels 220 and 222 swing the leg mounting portions of the iirst and last sections of the coil 'II through an angle of rotation of 90.

It will be further understood that if it be desired to rotate the bending chisels through any desired angle between 0 and 180 that additional adjustment holes, similar to the holes 230 and 232, may be provided in the segment 226. Thus, any desired swing of the chisels 220 and 222 may be achieved without changing the shape of the bending chisel operating cam |22.

Bending chisel mounting The upper portion 234 of the hinged elements 2I3, and 2I4 (Figs. 5 and 7) preferably have a circular sector horizontal cross section. The upper portion 234 of the hinged element 213 carries a lipped coil positioning guide 235 on the edge adjacent the bending blade l0 for holding the unbent portion of the coil 'lI in the horizontal plane of the upper portion 234. A bending chisel mounting plate 236 is secured to the outer periphery of each upper portion 234, of the hinged elements 2|3 and 2|4.

Each of these plates 236 has an annular segment portion 238, contoured to fit the periphery of the upper portion 234 of the hinged elements 2 I3 and 2 I4. The segment portions 238 are provided with adjustment slots 240 and are secured to the upper portions 234 of the hinged elements 2 |3 and 2I4, as by bolts extending through these slots 240. It will be understood that a wide range of desired angular locations of the bending chisels 220 and 222 may be achieved by means of these slots 240.

Each of the bending chisel mounting plates 23B has a rearward extension or chisel holder mounting bracket 242, on which a split collar chisel holder 244 (Fig. 7) is mounted. These chisel holders 244 are held together by suitable bolts and are provided with longitudinal chisel slots for reception therein of the chisels 220 and 222. The rearward portion of each of the bending chisels 220 and 222, carries a combination terminal block and positioning bracket 246.

Each of the combination terminal block and positioning brackets 246 is provided with a series of horizontal holes, namely, a positioning rod hole, a chisel mounting hole and a terminal hole. The upper end of each bracket 24B is bifurcated by a slot extending from the top of the block 246 to the chisel mounting hole. The bifurcated ends of the bracket 246 are secured together by means of a bolt. In turn the bending chisels 220 and 222 and the heating circuit terminal connections are xed securely in the bending chisel holes and terminal holes by means of a bending chisel mounting bolt 248, and a similar bolt respectively. The bracket 24B carries a headed positioning rod 250 in the positioning rod hole. The forward end of each rod 250 normally rests against a chisel holder 244.

It will be understood that accurate radial positioning of the bending chisels 220 and 222 may be obtained by loosening the bending chisel mounting bolts 248 in the brackets 246, thus permitting the brackets 246 to slide with a desired amount of friction on either or both of the bending chisels 220 and 222. Insertion of a feeler gauge between the forward end of the positioning rod 250 and the chisel holders 244 gives an accurate setting for the desired amount of movement of the bending chisels 220 and 222. After the desired setting is obtained the bending chisel mounting bolt 243 is tightened. The split collar chisel holder 244 is moved backwardly the desired distance against the inner end oi the positioning rod 250, thus producing accurate radial positioning of either or both of the bending chisels 220 and 222.

Bending chisel The improved bending chisels 220 and 222 of our invention are provided with outwardly tapered flats on their operating ends to provide support and clearance to the already bent por- -tions of the coil '|I during the bending of a subsequent section. It will be understood that in monoplane coil bending these already formed sections of the resilient coil are supported on the bending chisel flats and remain in a relatively horizontal plane.

Coil heating switch control mechanism Preheating circuit for coil The coil preheating circuit (Fig. 17) has one side of the voltage supply, LI, connected to the bending blade l0. The other side of the supply, L2, isv connected through the normally open micro switch 34 and the variable resistor 35 to the bending chisel 222. The other bending chisel 220 is tied electrically to the chisel 222 by a suitable line. It will be understood that the downward motion of the hand lever I4 pushes the bending blade 'l0 into contact with the continuous coil 1|, and the coil 'in turn against the `bending chisels 220 and 222, and closes preheat switch 34, thereby completing the circuit.

M ain heating circuit for coil Inthe main coil heating circuit, as shown in Fig. 17, normally open microswitch |74 and variable resisto-r in electrical series with each other, are in electrical parallel with the preheat switch 34 and variable resistor 85. The circuit is completed by the closing of heating switch |14 upon operation of the cam |86.

Filament section forming operation According to our invention, the continuous co-il 'H is placed along the guide 285 and under the lip thereof on the upper portion 234 of the hinged element 2 l2, shown in Fig. 8, and moved toward the locator-92, (which is in its in position) so that its forward end is sufficiently close to the coil stop slot 204 in the coil stop-200. This insures that the portion selected for bending will be sufliciently large to form a mounting leg portion and a coil `section which we call #1.

As the starting hand lever I4 is moved downwardly, the bending blade i0 simultaneously starts its inward or forward movement, as shown in Figure 18, toward coil "il on the center hinge post |54. It will be understood that as the shaft I6 and the bending blade trip arm 80 rotate counterclockwise, due to the downward movement of the lever 4, the shaft 54 and the -gear segment 58 thereon are rotated clockwise by means of the arm 52. This clockwise motion of the segment 58 moves the rack59 to the right, as viewed in Figs. land 2, in the trough 60, until the bending blade T0 just touches the coil 1|, positioned Yagainst the chisels 220 and '222.

When the bending blade l0 has completed approximately 1/2 of its travel, as shown in Fig-` 18, the micro switch 84 inthe coil prelieat circuit is closed by the action of vthe trip arm 32 -o-n the 'slide' rod v28. The counterclockwise rotation Yof the shaft 8 and arm 28 thereon causesfthe slide rod 28, and hence the trip-arm 32 thereon, to move diagonally upward, as shown in Figure 1, to close the switch 34, also shown in Fig, 17, and thereby supply -preheatA current to the coil il. This switch 34 remains closed until the hand lever I4 is released. Slightly before the lever i4 and the bending' blade 'I0 reach the end of their respective travels, the clutch release lever 46 on the shaft-42 releases the one revolution clutch 4l, and the cam shaft 48, driven vby a motor (not shown), with the cams 90, |2|, V|22 and |86 thereon, start their revolution. The clockwise rotation of shaft AI6 and the arm 26 thereon, causing the diagonally upward movement of the slide rod 28, also causes the vclockwise rotation of the shaft A42 and the clutch release lever 26 thereon, by means of the connections heretofore described.

' As the main cam shaft 48 starts to turn, the main heating micro switch |14 is closed by engagement of a raised portion of the coil heating switch control cam |86 with the roller |58 on contact arm |70. As shown in Figure 1'7, closing of the switch |14 supplies heating current through the resistor |75 and the bending chisels 220 and 222 to the coil '|I.

Further rotation of the main cam shaft 48 and cam |20 thereon, positions the bending blade 10 in its nal position, approximately .015 further Y into the space between the two preselected turns of the Vcoil 1|, therebysecurely holding vone turn 2 3 rand 2 4 connected thereto back to their start- Ll0 of the coil between the bending blade 10 and the two bending chisels 220 and 222, which are now inserted from the opposite direction in the adjacent spacesl in the two preselected turns which bound the blade receiving space. A raised portion of the bending blade final positioning cam `|2| moves the roller 18, and hence the roller arm 14 andthe connecting rod l2, toward the left end ofthe machine, as shown in Fig. 1. This `motion of the rod. 'I2 moves the arm 52 on the shaft`54 and hence rotates clockwise the segment 58 on the other end of shaft 54, to cause the additional required motion of the 4bending blade 18.

ASimultaneously, (Fig. 18) the coil stop and locator cam moves the coil stop and locator 92 from its in7 position to its out position. Rotation of a raised portion of .the cam against the roller 98 moves the roller arm 94 and the connecting rod |00v horizontally to .the right, as shown in Figs. 1 and 2. This motion rotates the lower-arm |02 on -the bottom of the shaft |04, and hence the `shaft |04 and the upper arm |08'on the upper portion of the shaft |04 with its pin 83 onthe outer end, clockwise in a horizontal plane. This pin 03 in the groove V|08 on the rearward portion of the coil stop and locator 92, moves the locator S92 away from the post |54 or to its out position.

yFurther rotation of the shaft 48 causes the bending chisels 228 and 222 to `swing on the hinged elements 2 I2 and 2 3, respectively, about the center hinge post |54, as shown in Fig 9, and bend the coil *Il about its preselected turn into parallel sections aligned along the bending blade 10. This action of the chisels is accomplished by operation vof the bending chisel operating cam |22 through its connecting linkage. A raised portion Iof the cam |22 moves the roller |28 on the lower .220 and 222, the main heating switch |14 is opened by means of the coil heating switch control cam |86. Further rotation ofthe ,shaft 48 moves the roller |28 on the lower4 arm 2| I of the crank 208 off the raised portion of cam |22 thereby moving the slide` block- VI 40 and the bending chisels ing position, with the aid of the return spring |42, as .shown in Fig. 1.

Before the bending chisels complete their return to the starting orneutral position, roller 18 .on arm 'i4 runs oi the raised portion of the lbending blade final positioning cam I2| thus lretracting the bending blade l0 and the now bent coil 1| thereon (Fig. 10) by .means of the connecting mechanism explained above .and the return spring 80 (Fig. 1) .on the'end of rod 12.

l l 'main cam shaft 48, which requires a few seconds, the clutch release lever 46 engages the one-revolution clutch 41 and stops further rotation of the shaft 48 and the cams 90, |2I, |22 and |68 thereon.

The now bent coil 1I is removed from the bending blade il) and inserted by hand into the coil stop slot 224 oi the coil stop 250 (Fig. 11) on the inner end of the coil stop and locator 92.

It will be understood that the unbent portion of the coil 1| is held flat on the upper portions 234 of the hinged elements 2|2 and 2 i3 by the lipped positioning guide 235 and that the bent iirst section of the coil 1|, resting on the tapered flats of the bending chisels 220 and 222 is also in a relatively horizontal plane.

It will be understood that this slot 294 is positioned so that the distance from the inner face of the slot to the center of the hinge post |54, the point of contact of the bending blade 'l0 with the coil 1|, is the desired distance or the desired number of turns between bends yet to be formed in the next section of the coil l I. Considered another way, this above mentioned position of the slot 224 in locator 92 determines the length of the ve remaining sectionsof a iilament 252 (shown in Figs. 3 and 4) to be formed from the coil 1| for a projection lamp 254. Further the improved transparent coil stop 209 provides better operator visibility and.hence a more uniform light source can be obtained.

As the cycle is repeated and successive bends or sections of the filament 252 are formed in the coil 1| by the method described above, the coil '1| is positioned in the slot 204 at the start of each succeeding cycle. As shown in Figure 12, the already formed five sections are positioned on the tapered flats of the bending chisels 22!! and 222.

Filament leg forming operation After the last section of the coil 1| has been formed, the maintenance man removes the pin 228 from the 180 bending hole 230 (Fig. 15) in the segment 226 of the lower arm 2 H of the improved bell crank lever 208 for the bending chisel operating slide |40. This pin 228 is then inserted through the upper arm 2|2 and into the 90 bend hole 232 in the segment 22S.

As explained before this simple operation moves the roller |28 upwardly away from the bending chisel operating cam |22 (Fig. 16) and achieves a change over to the desired 90 lament mounting leg bend without disturbing or changing cam |22.

As shown in (Fig, 13) the iii-st and second sections of the coil 1| are positioned in the coil stop slot 204 of the coil stop 200. With the new arrangement of the improved bell crank lever 268,

Ythe bending chisel 220 and 222 are swung through the predetermined angle, by the means described above, to form a filament mounting leg portion which is perpendicular to the iirst section of the coil 1|. In like manner, as shown in Fig. 14, the fifth and last sections of the coil 1| are positioned in the coil stop slot 2M and a iilament mounting leg portion is likewise formed in the last section of the continuous coil '1| thus forming the filament 252.

Although a preferred embodiment of our invention has been described, it will be understood that modiiications may be made within the spirit and scope of the invention.

We claim:

1` A machine for bending a continuous coil into a monoplane multi-section projection lamp iilament having a predetermined number of turns between sections comprising; a frame, a bending blade mounted on said frame for movement against and then insertion into a space between two preselected turns of said coil, a pair of swingable bending chisels mounted on said frame in normally relatively parallel spaced relation opposite said bending blade for insertion from the opposite direction into the adjacent spaces in the preselected turns which bound the blade receiving space, a coil stop and locator mounted on said frame transverse to said blade and said bending chisels for determining the preselected turns, a main cam shaft mounted on said frame, a one revolution clutch, a coil stop and locator cam, a bending blade iinal positioning cam, and a bending chisel operating cam on said main shaft, means for moving said blade into contact with said coil and for releasing said one revolution clutch, means for transmitting sliding motion to said bending blade from said bending blade iinal positioning cam, a bending chisel operating mechanism for transmitting rotary motion to said bending chisels about a common axis from said bending chisel operating cam comprising; a bell crank lever having a separable lower arm provided with an angular segment adjacent its hub and carrying means thereon for engagement with said bending chisel operating cam, a separable bifurcated upper arm and means for joining said arms in any desired angular relationship therebetween, a bending chisel slide block connected to said biiurcated upper arm, and means for transforming the sliding motion of said block into rotary motion of said bending chisels, means for transmitting in and "out motion to said coil stop and locator from said coil stop and locator cam, and means for rotating said cam shaft.

2. A machine for bending a continuous coil into a monoplane multi-section projection lamp filament having a predetermined number of turns between sections comprising; a frame, a bending blade mounted on said frame for movement against and then insertion into a space between two preselected turns of said coil, a pair of hinged elements mounted on said frame, each element having a horizontal upper portion, a lipped coil positioning guide on one of said upper portions of said elements for holding the unbent portion of said continuous coil in a horizontal plane, a bending chisel mounting plate secured to the periphery of each of said upper portions of said hinged elements and comprising a segment provided with meansfor securing said mounting plate in any desired angular alignment and a chisel holder mounting bracket, a chisel holder on said bracket, a radially movable bending chisel secured in said chisel holder, a combination terminal block and positioning bracket on said chisel and a positioning rod on said combination block and bracket for radially adjusting said bending chisel, a coil stop and locator mounted on said frame transverse to said blade and said bending chisels for determining the preselected turns, a main cam shaft mounted on said frame, a one revolution clutch, a coil stop and locator cam, a bending blade nnal positioning cam, and a bending chisel operating cam on said main shaft, means for moving said blade into contact with said coil and for releasing said one revolution clutch, means for transmitting sliding motion to said bending blade from said bending blade nal positioning cam, a bending chisel operating mechanism for transmitting 13 rotary motion to said bending chisels about a common axis from said bending chisel operating cam, means for transmitting in and out motion to said coil stop and locator from said coil stop and locator cam, and means for rotating said cam shaft.

3. A machine for bending a continuous coil into a monoplane multi-section projection lamp iilament having a predetermined number of turns between sections comprising: a frame, a bending blade mounted on said frame for movement against and then insertion into a space between two preselected turns of said coil, a pair of hinged elements mounted on said frame, each element having a horizontal upper portion, a lipped coil positioning guide on one of said upper portions of said elements for holding the unbent portion of said continuous coil in a horizontal plane, a bending chisel mounting plate secured to the periphery of each of said upper portions of said hinged elements and comprising a segment provided with means for securing said mounting plate in any desired angular alignment and a chisel holder mounting bracket, a chisel holder on said bracket, a radially movable bending chisel secured in said chisel holder, a combination terminal block and positioning bracket on said chisel and a positioning rod on said combination block and bracket for radially adjusting said bending chisel, each of said bending chisels having an outwardly tapered ilat on its operating end for supporting and maintaining the already bent sections of said continuous coil in a relatively horizontal plane, a coil stop and locator mounted on said frame transverse to said blade and said bending chisels for determining the preselected turns, a main cam shaft mounted on said frame, a one revolution clutch, a coil stop and locator cam, a bending blade iinal positioning cam, and a bending chisel operating cam on said main shaft, means for moving said blade into contact with said coil and for releasing said one revolution clutch, means for transmitting sliding motion to said bending blade from said bending blade final positioning cam, a bending chisel operating mechanism for transmitting rotary motion to said bending chisels about a common axis from said bending chisel operating cam, means for transmitting in and out motion to said coil stop and locator from said coil stop and locator cam and means for rotating said cam shaft.

4. A machine for bending a continuous coil into a monoplane multi-section projection lamp iilament having a predetermined number of turns between sections comprising; a frame, a bending blade mounted on said frame for movement against and then insertion into a space between two preselected turns of said coil, a pair of swingable bending chisels mounted on said frame in normally relatively parallel spaced relation opposite said bending blade for insertion from the opposite direction into the adjacent spaces in the preselected turns which bound the blade receiving space, a coil stop and locator mounted on said frame transverse to said blade and said bending chisels for determining the preselected turns and having a transparent coil stop provided with a coil stop slot in its operating end for positioning therein a formed section and an adjacent section to -be formed of said continuous coil, a main cam shaft mounted on said frame, a one revolution clutch, a coil stop and locator cam, a bending blade iinal positioning cam, and a bending chisel operating cam on said main shaft, means for moving said blade into contact with said coil and for releasing said one revolution clutch, means for transmitting sliding motion to said bending blade from said bending blade nal positioning cam, a bending chisel operating mechanism for transmitting rotary motion to said bending chisels about a common axis from said bending chisel operating cam, means for transmitting in and out motion to said coil stop and locator from said coil stop and locator cam and means for rotating said cam shaft.

References Cited in the ille of this patent UNITED STATES PATENTS Mann Oct. 20, 1953 

